Dear Juan,
If you do not want your girlfriend to leave, you need to listen to me carefully. You were wrong. In a relationship, no matter the situation, the guy is always wrong. Be a man and tell her you made a mistake. I am sure she would appreciate an honest answer rather than excuses. You need to tell her what really happened and hopefully she will forgive you.

In addition to saying how sorry you are, you also need to do something special for her to show her your love. Since you still owe her a date, you should take her to her favorite restaurant for dinner. I recommend you also buy her a bouquet of roses and a box of chocolate. Above all, make her feel special and show her how much you care for her. Your girlfriend just wants to know that you love her and wants to spend some time with you. If you love her, you will take her on this date and enjoy a nice night together.

Please remember that this is not a translation site. Are you studying Spanish? If so, you need to DO the work first and then we HELP. It is a bad idea to write it out in English first and then try to translate literally/word for word. Use the structures and vocabulary you have mastered in class.

I'll be only too happy to HELP you after you DO what you can. Your advice is wonderful, but, in my opinion, the man is not ALWAYS wrong!